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:: Volume 6, Issue 2 (2020) ::
pgr 2020, 6(2): 157-172 Back to browse issues page
Effect of Exogenous Brassinosteroid Application on Grain Yield, some Physiological Traits and Expression of Genes Related to This Hormone Signaling Pathway in Wheat under Drought Stress
Mehrnoosh Rafeie , Mohammad Reza Amerian * , Behzad Sorkhi , Parviz Heidari , Hamid Reza Asghari
Department of Agronomy and Plant Breeding, Faculty of Agriculture, Shahrood University of Technology, Shahrood, Iran , amerianuk@yahoo.co.uk
Abstract:   (12917 Views)
To investigate the effect of exogenous brassinosteroid application on grain yield, catalase, chlorophyll content, membrane mtability index and gene expression of some genes involving in brassinosteroid signaling pathway (BES1 and BRI1) under drought stress, a split-split plot on randomized complete block design with three replications was conducted at the experimental field of Seed and Plant Improvement Institute, Karaj, Iran in 2019. The main factor was two irrigation treatments (normal irrigation and water holding after 50% flowering stage), the subplots were four concentrations of brassinosteroid (0, 0.25, 0.625 and 1 mg/l) and seven genotypes (Mehregan, Paris, 2858, 3505, 3737, 4228 and 4056) were considered as sub-sub plots. Samples were taken at 30 days after 50% flowering stage (zadoks 89) from flag leaves. The results showed that drought stress significantly reduced grain yield, chlorophyll content, membrane stability index and increased catalase in all genotypes. Genotype 4228 was identified as the most tolerant genotype among unknown wheat genotypes based on grian yield, chlorophyll content, membrane stability index and catalase. Also, the result revealed that applied epibrassinolide could reduce the destructive effects of drought stress on wheat thus grain yield was enhanced under drought stress in all genotypes by increasing the aforementioned traits. Forethermore, grain yield was increased by rising the epibrasinolide concentration. Gene expression pattern of TaBES1 and TaBRI1 using real-time PCR showed that although brassinosteroid enhances drought tolerance in wheat but its signaling pathway is different from the BRI1 signaling pathway.
Keywords: Brassinosteroid, Gene expression, Drought stress, Wheat, Real-time PCR
Full-Text [PDF 1127 kb]   (1962 Downloads)    
Type of Study: Research | Subject: Plant improvement
Accepted: 2019/12/24
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Rafeie M, Amerian M R, Sorkhi B, Heidari P, Asghari H R. Effect of Exogenous Brassinosteroid Application on Grain Yield, some Physiological Traits and Expression of Genes Related to This Hormone Signaling Pathway in Wheat under Drought Stress. pgr 2020; 6 (2) :157-172
URL: http://pgr.lu.ac.ir/article-1-134-en.html


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